Relevant bibliographies by topics / Collision Cross Section (CCS)

Academic literature on the topic 'Collision Cross Section (CCS)'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Collision Cross Section (CCS).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Collision Cross Section (CCS)"

1

Yang, Fan, Denice van Herwerden, Hugues Preud’homme, and Saer Samanipour. "Collision Cross Section Prediction with Molecular Fingerprint Using Machine Learning." Molecules 27, no. 19 (September 29, 2022): 6424. http://dx.doi.org/10.3390/molecules27196424.

Full text
Abstract:
High-resolution mass spectrometry is a promising technique in non-target screening (NTS) to monitor contaminants of emerging concern in complex samples. Current chemical identification strategies in NTS experiments typically depend on spectral libraries, chemical databases, and in silico fragmentation tools. However, small molecule identification remains challenging due to the lack of orthogonal sources of information (e.g., unique fragments). Collision cross section (CCS) values measured by ion mobility spectrometry (IMS) offer an additional identification dimension to increase the confidence level. Thanks to the advances in analytical instrumentation, an increasing application of IMS hybrid with high-resolution mass spectrometry (HRMS) in NTS has been reported in the recent decades. Several CCS prediction tools have been developed. However, limited CCS prediction methods were based on a large scale of chemical classes and cross-platform CCS measurements. We successfully developed two prediction models using a random forest machine learning algorithm. One of the approaches was based on chemicals’ super classes; the other model was direct CCS prediction using molecular fingerprint. Over 13,324 CCS values from six different laboratories and PubChem using a variety of ion-mobility separation techniques were used for training and testing the models. The test accuracy for all the prediction models was over 0.85, and the median of relative residual was around 2.2%. The models can be applied to different IMS platforms to eliminate false positives in small molecule identification.
APA, Harvard, Vancouver, ISO, and other styles
2

Soper-Hopper, M. T., J. Vandegrift, E. S. Baker, and F. M. Fernández. "Metabolite collision cross section prediction without energy-minimized structures." Analyst 145, no. 16 (2020): 5414–18. http://dx.doi.org/10.1039/d0an00198h.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Li, Dayu, Yang Tang, and Wei Xu. "Ion collision cross section measurements in Fourier transform-based mass analyzers." Analyst 141, no. 12 (2016): 3554–61. http://dx.doi.org/10.1039/c5an02164b.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Lippens, Jennifer L., Srivathsan V. Ranganathan, Rebecca J. D'Esposito, and Daniele Fabris. "Modular calibrant sets for the structural analysis of nucleic acids by ion mobility spectrometry mass spectrometry." Analyst 141, no. 13 (2016): 4084–99. http://dx.doi.org/10.1039/c6an00453a.

Full text
Abstract:
This study explored the use of modular nucleic acid (NA) standards to generate calibration curves capable of translating primary ion mobility readouts into corresponding collision cross section (CCS) data.
APA, Harvard, Vancouver, ISO, and other styles
5

Hernández-Mesa, Maykel, Bruno Le Bizec, Fabrice Monteau, Ana M. García-Campaña, and Gaud Dervilly-Pinel. "Collision Cross Section (CCS) Database: An Additional Measure to Characterize Steroids." Analytical Chemistry 90, no. 7 (March 12, 2018): 4616–25. http://dx.doi.org/10.1021/acs.analchem.7b05117.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Forsythe, Jay G., Anton S. Petrov, Chelsea A. Walker, Samuel J. Allen, Jarrod S. Pellissier, Matthew F. Bush, Nicholas V. Hud, and Facundo M. Fernández. "Collision cross section calibrants for negative ion mode traveling wave ion mobility-mass spectrometry." Analyst 140, no. 20 (2015): 6853–61. http://dx.doi.org/10.1039/c5an00946d.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Guntner, Armin Sebastian, Thomas Bögl, Franz Mlynek, and Wolfgang Buchberger. "Large-Scale Evaluation of Collision Cross Sections to Investigate Blood-Brain Barrier Permeation of Drugs." Pharmaceutics 13, no. 12 (December 13, 2021): 2141. http://dx.doi.org/10.3390/pharmaceutics13122141.

Full text
Abstract:
Successful drug administration to the central nervous system requires accurate adjustment of the drugs’ molecular properties. Therefore, structure-derived descriptors of potential brain therapeutic agents are essential for an early evaluation of pharmacokinetics during drug development. The collision cross section (CCS) of molecules was recently introduced as a novel measurable parameter to describe blood-brain barrier (BBB) permeation. This descriptor combines molecular information about mass, structure, volume, branching and flexibility. As these chemical properties are known to influence cerebral pharmacokinetics, CCS determination of new drug candidates may provide important additional spatial information to support existing models of BBB penetration of drugs. Besides measuring CCS, calculation is also possible; but however, the reliability of computed CCS values for an evaluation of BBB permeation has not yet been fully investigated. In this work, prediction tools based on machine learning were used to compute CCS values of a large number of compounds listed in drug libraries as negative or positive with respect to brain penetration (BBB+ and BBB− compounds). Statistical evaluation of computed CCS and several other descriptors could prove the high value of CCS. Further, CCS-deduced maximum molecular size of BBB+ drugs matched the dimensions of BBB pores. A threshold for transcellular penetration and possible permeation through pore-like openings of cellular tight-junctions is suggested. In sum, CCS evaluation with modern in silico tools shows high potential for its use in the drug development process.
APA, Harvard, Vancouver, ISO, and other styles
8

Schroeder, Mark, Sven W. Meyer, Heino M. Heyman, Aiko Barsch, and Lloyd W. Sumner. "Generation of a Collision Cross Section Library for Multi-Dimensional Plant Metabolomics Using UHPLC-Trapped Ion Mobility-MS/MS." Metabolites 10, no. 1 (December 24, 2019): 13. http://dx.doi.org/10.3390/metabo10010013.

Full text
Abstract:
The utility of metabolomics is well documented; however, its full scientific promise has not yet been realized due to multiple technical challenges. These grand challenges include accurate chemical identification of all observable metabolites and the limiting depth-of-coverage of current metabolomics methods. Here, we report a combinatorial solution to aid in both grand challenges using UHPLC-trapped ion mobility spectrometry coupled to tandem mass spectrometry (UHPLC-TIMS-TOF-MS). TIMS offers additional depth-of-coverage through increased peak capacities realized with the multi-dimensional UHPLC-TIMS separations. Metabolite identification confidence is simultaneously enhanced by incorporating orthogonal collision cross section (CCS) data matching. To facilitate metabolite identifications, we created a CCS library of 146 plant natural products. This library was generated using TIMS with N2 drift gas to record the TIMSCCSN2 of plant natural products with a high degree of reproducibility; i.e., average RSD = 0.10%. The robustness of TIMSCCSN2 data matching was tested using authentic standards spiked into complex plant extracts, and the precision of CCS measurements were determined to be independent of matrix affects. The utility of the UHPLC-TIMS-TOF-MS/MS in metabolomics was then demonstrated using extracts from the model legume Medicago truncatula and metabolites were confidently identified based on retention time, accurate mass, molecular formula, and CCS.
APA, Harvard, Vancouver, ISO, and other styles
9

Tejada-Casado, Carmen, Maykel Hernández-Mesa, Fabrice Monteau, Francisco J. Lara, Monsalud del Olmo-Iruela, Ana M. García-Campaña, Bruno Le Bizec, and Gaud Dervilly-Pinel. "Collision cross section (CCS) as a complementary parameter to characterize human and veterinary drugs." Analytica Chimica Acta 1043 (December 2018): 52–63. http://dx.doi.org/10.1016/j.aca.2018.09.065.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Wang, Jian-Ying, Ying-Hao Yin, Jia-Yi Zheng, Li-Fang Liu, Zhong-Ping Yao, and Gui-Zhong Xin. "Least absolute shrinkage and selection operator-based prediction of collision cross section values for ion mobility mass spectrometric analysis of lipids." Analyst 147, no. 6 (2022): 1236–44. http://dx.doi.org/10.1039/d1an02161c.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Collision Cross Section (CCS)"

1

Hupin, Sébastien. "Caractérisation d’auto-assemblages de polyoxométallates hybrides organiques-inorganiques par spectrométrie de mobilité ionique couplée à la spectrométrie de masse." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMR062.

Full text
Abstract:
Les polyoxométallates (POM) sont des composés anioniques constitués par l’assemblage de polyèdres d’oxydes métalliques {MOy}, (avec M, MoVI ou WVI) reliés entre eux par des atomes d'oxygène. Les POM forment ainsi une classe remarquable de clusters d’oxydes métalliques inorganiques nanométriques, avec une grande variété de charges et de structures. Il est possible de former des systèmes hybrides incluant la partie inorganique du POM et une partie organique greffée, permettant d’apporter de nouvelles fonctionnalités aux POM, tel que l’auto-assemblage. Nous avons consacré ces travaux de thèse à la caractérisation de systèmes classiques, hybrides et auto-assemblés de POM par spectrométrie de masse couplée à la spectrométrie à la mobilité ionique (IMS-MS). Une première approche expérimentale par spectrométrie de mobilité ionique en tube de dérive (DTIMS) nous a permis de déterminer les sections efficaces de collisions (CCS) de POM étalons dans l’hélium et dans l’azote. Les CCS des étalons POM nous ont ensuite permis d’étalonner une cellule IMS de type Travelling Wave (TWIMS). L’analyse par IMS-MS de POM hybrides organiques-inorganiques seuls ou en présence de PdCl2 a mis en évidence la présence de systèmes auto-assemblés triangulaires [POM3·cation3], carrés [POM4·cation4] ou pentagonaux [POM5·cation5] avec différents états de charges. Des valeurs de CCS de ces auto-assemblages ont également pu être estimées à partir de l’étalonnage de la cellule TWIMS. Par une approche théorique, nous avons modélisé plusieurs structures de POM standards avec et sans contre-ion tetrabutylammonium (TBA+) par la théorie de la fonctionnelle de la densité (DFT). Les structures optimisées ont été utilisées afin de déterminer des CCS théoriques grâce au logiciel MOBCAL, auquel nous avons incorporé les atomes de molybdène et de tungstène pour lesquels nous avons optimisé de nouveaux paramètres de potentiel de Lennard Jones. La correspondance des CCS expérimentales et théoriques des structures de POM standards offre de nouvelles possibilités pour une attribution structurale pour les POM hybrides auto-assemblés par coordination en présence de cations métalliques
Polyoxometalates (POM) are anionic compounds formed by the assembly of metal oxide polyhedra {MOy}, (with M, MoVI or WVI) linked together by oxygen atoms. POM thus form a remarkable class of nanometric inorganic metal oxide clusters, with a wide variety of charges and structures. It is possible to form hybrid systems including the inorganic part of the POM and a grafted organic part, allowing new functionalities to be added to the POM, such as selfassembly. We have dedicated this thesis work to the characterization of standards, hybrid and self-assembled POM systems by mass spectrometry coupled to ion mobility spectrometry (IMS-MS). A first experimental approach using drift tube ion mobility spectrometry (DTIMS) allowed us to determine the collision cross sections (CCS) of standard POM in helium and nitrogen. The CCS of the POM standards then allowed us to calibrate an IMS cell of a Travelling Wave ion mobility instrument (TWIMS). The analysis by IMS-MS of organic-inorganic hybrid POMs alone or in the presence of transition metal cations revealed the presence of self-assembled triangular [POM3·cation3], square [POM4·cation4] or pentagonal [POM5·cation5] systems with different charge states. CCS values of these self-assemblies was estimated from the calibration of the TWIMS cell. Using a theoretical approach, we modelled several standard POM structures with and without tetrabutylammonium counterion (TBA+) using density functional theory (DFT). The optimized structures were used to determine theoretical CCS using the trajectory method of the MOBCAL software, in which we incorporated molybdenum and tungsten atoms for which we optimized new Lennard Jones potential parameters. The correspondence of experimental and theoretical CCS of standard POM structures offers new possibilities for structural attribution of self-assembled hybrid POM by coordination in the presence of metal cations
APA, Harvard, Vancouver, ISO, and other styles
2

Fu, Jun. "FHBS calculation of ionized electron angular and energy distribution following the p+H collision at 20 keV." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/1240.

Full text
Abstract:
A Finite Hilbert Basis Set (FHBS) method to calculate the angular and energy distribution of ejected electrons in an ion-atom collision is presented. This method has been applied to the p + H collision at 20 keV impact energy. An interference effect between the exit channels, where electrons are guided out of the collision region by both the residual target proton and the projectile proton, is discovered. Experimental data appears to confirm this result.
APA, Harvard, Vancouver, ISO, and other styles
3

Bostock, Francis John Douglas. "Measurement of the tt cross section with early lhc collision data at cms." Thesis, University of Bristol, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.549452.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Ma, Xin. "Ion Mobility Mass Spectrometry of DNA/SgrAI Nuclease Oligomers." Thesis, The University of Arizona, 2012. http://hdl.handle.net/10150/247282.

Full text
Abstract:
SgrAI is a restriction endonuclease (ENase) that cuts a long recognition sequence and exhibits self-modulation of cleavage activity and sequence specificity. Previous research has shown that SgrAI forms large oligomers when bound to particular DNA sequences and under the same conditions where SgrAI exhibits accelerated DNA cleavage kinetics. However, the detailed structure and stoichiometry of SgrAI:DNA as well as the basic building block of the oligomers, has not been fully characterized. Ion mobility mass spectrometry (IM-MS) was employed to analyze SgrAI/DNA complexes and show that the basic building block of the oligomers is the DNA-bound SgrAI dimer (DBD). The oligomers are heterogeneous containing a mixture of species with variable numbers of DBD. The collision cross sections (CCS) of the oligomers were found to have a linear relationship with the number of DBD. Models of the SgrAI/DNA oligomers were constructed and a head-to-tail arrangement was most consistent with the experimental CCS.
APA, Harvard, Vancouver, ISO, and other styles
5

Le, Maître Johann. "Développement de la spectrométrie de masse à ultra- haute résolution associée à la spectrométrie de mobilité ionique pour la caractérisation de coupes pétrolières lourdes. structural analysis of heavy oil fractions afterr hydrodenitrogenation by high-resolution tandem mass spectrometry and ion mobility spectrometry Structural analysis of neutral nitrogen compounds refractory to the hydrodenitrogenation process of heavy oil fractions by high-resolution tandem mass spectrometry and ion mobility-mass spectrometry Chemical characterization of 15 biocrudes obtained from hydrothermal liquefaction of industrially cultivated wild micro algae Chemical characterization with different analytical techniques, a way to understand the process: Case of the paraffinic base oil production line Exploring complex mixtures by cyclic ion mobility high-resolution mass spectrometry – Application towards Petroleum. Simulation and modeling of Collision Cross Section for structural elucidation of heavy oil fraction by ion mobility-mass spectrometry: Using polyaromatic hydrocarbons compounds mixture as calibration standard Characterization of sulfoxides compounds in dimeric distribution of heavy oil fractions by positive-ion electrospray ionization FTICR mass spectrometry Structural analysis of Petroporphyrins from asphaltene by trapped ion mobility coupled with a Fourier transform ion cyclotron resonance mass spectrometer. Cyclic ion mobility spectrometry coupled to high-resolution time-of-flight mass spectrometry equipped with atmospheric solid analysis probe for the molecular characterization of combustion particulate matter. Structural study of analogues of Titan’s haze by trapped ion mobility coupled with a Fourier transform ion cyclotron mass spectrometer." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR051.

Full text
Abstract:
L'évolution des réserves de pétrole implique l'utilisation en raffinerie de pétroles bruts non conventionnels, bien souvent plus lourds et donc difficiles à caractériser. Les produits pétroliers sont en effet des mélanges chimiques extrêmement complexes. La partie légère et volatile peut être analysée par chromatographie en phase gazeuse couplée à la spectrométrie de masse (GC/MS), permettant l'identification des composés par l'utilisation de mesures de masses précises et de modèles de fragmentation. Cependant ces techniques sont inadaptées à l'analyse des fractions lourdes. Dans la pratique, la caractérisation des mélanges les plus complexes implique l'utilisation de spectromètres de masse à ultra-haute résolution généralement par analyse directe sans séparation chromatographique. La technique de référence est aujourd’hui la spectrométrie de masse à transformée de Fourier par résonance cyclotronique des ions (FTICR). Grâce à une résolution supérieure à 106 et à une précision de mesure de masse inférieure à 0,1 ppm, cet instrument permet de séparer toutes les espèces présentes dans un produit pétrolier et d'attribuer à chaque valeur de m/z une composition élémentaire unique. Ceci permet d'obtenir très facilement des cartes moléculaires qui peuvent être présentées graphiquement en utilisant le diagramme de Kendrick, le diagramme de van Krevelen ou le nombre d'insaturations (DBE) en fonction du nombre de carbones. Ce travail de thèse a permis grâce à la caractérisation moléculaire de produits pétroliers (Vacuum Gas Oil, Pétroles Bruts, Matériel Interfacial, Asphaltènes et Bio-Oil…) d'aborder la complexité de leur traitement dans l’outil de raffinage. Des protocoles d'analyses des échantillons ont été développés, à l'aide de différentes sources d'ionisation à pression atmosphérique (ESI, APCI et APPI) ainsi que par désorption/ionisation laser (LDI) sur le spectromètre de masse FTICR 12T. Les informations sur le contenu isomérique des produits pétroliers ont ensuite été déterminées grâce à l'apport de la spectrométrie de mobilité ionique (IMS)
The evolution of oil reserves requires the use in refineries of unconventional crude oils, which are often heavier and therefore difficult to characterize. Petroleum products are in fact extremely complex chemical mixtures. The light and volatile part can be analysed by gas chromatography coupled with mass spectrometry (GC/MS), allowing the identification of compounds by using precise mass measurements and fragmentation models. However, these techniques are inappropriate for the analysis of heavy fractions. In practice, the characterization of the most complex mixtures involves the use of ultra-high-resolution mass spectrometers generally by direct analysis without chromatographic separation. The reference technique today is Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR). With a resolution of more than 106 and a mass measurement accuracy of less than 0.1 ppm, this instrument can separate all the species present in a petroleum product and assign a unique elemental composition to each m/z value. This makes it very easy to obtain molecular maps that can be presented graphically using the Kendrick diagram, the van Krevelen diagram or the number of unsaturations (DBE) as a function of the number of carbons. This thesis work has allowed thanks to the molecular characterization of petroleum products (Vacuum Gas Oil, Crude Oil, Interfacial Material, Asphaltenes and Bio-Oil...) addressing the complexity of their treatment in the refining tool. Protocols for sample analysis have been developed, using different sources of ionization at atmospheric pressure (ESI, APCI and APPI) as well as laser desorption/ionization (LDI) on the FTICR 12T mass spectrometer. Information on the isomeric content of petroleum products was then determined using ion mobility spectrometry (IMS)
APA, Harvard, Vancouver, ISO, and other styles
6

Romano, Marino <1985&gt. "Measurement of the differential cross section of tt pairs in pp collision at sqrt(s) = 7TeV with the ATLAS detector at the LHC." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5197/.

Full text
Abstract:
In this thesis three measurements of top-antitop differential cross section at an energy in the center of mass of 7 TeV will be shown, as a function of the transverse momentum, the mass and the rapidity of the top-antitop system. The analysis has been carried over a data sample of about 5/fb recorded with the ATLAS detector. The events have been selected with a cut based approach in the "one lepton plus jets" channel, where the lepton can be either an electron or a muon. The most relevant backgrounds (multi-jet QCD and W+jets) have been extracted using data driven methods; the others (Z+ jets, diboson and single top) have been simulated with Monte Carlo techniques. The final, background-subtracted, distributions have been corrected, using unfolding methods, for the detector and selection effects. At the end, the results have been compared with the theoretical predictions. The measurements are dominated by the systematic uncertainties and show no relevant deviation from the Standard Model predictions.
In questo lavoro verranno presentate tre misure di sezione d'urto differenziale di eventi top-antitop ad un'energia nel centro di massa pari a 7 TeV in funzione dell'impulso trasverso, della massa invariante e della rapidità del sistema. L'analisi è stata effettuata su un campione di dati pari a circa 5/fb raccolti dal rivelatore ATLAS durante il run del 2011 dell'LHC. Gli eventi sono stati selezionati con un approccio basato sui tagli nel canale "leptone più jet", dove il leptone può essere un elettrone o un muone. I principali fondi (QCD multi-jet e W+ jet) sono stati estratti con metodi "data driven", mentre i rimanenti (Z+ jet, WW/ZZ/WZ e top singolo) sono stati simulati con tecniche Monte Carlo. Le distribuzioni finali, dopo la sottrazione del background, sono state corrette, attraverso procedure di unfolding, dagli effetti del rivelatore e della selezione. In questo modo è possibile confrontare i risultati ottenuti con quelli di altri esperimenti. Le misure risultano dominate dalle incertezze sistematiche e non mostrano alcuna deviazione significativa dalle predizioni del Modello Standard.
APA, Harvard, Vancouver, ISO, and other styles
7

Dutta, Baishali. "Measurement of W+W− production cross section in proton-proton collisions at √s = 13 TeV with the ATLAS detector." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19352.

Full text
Abstract:
Diese Arbeit stellt eine Messung des W+W- Produktionswirkungsquerschnitts in pp Kollisionen bei einer Schwerpunktenergie von √s = 13 TeV vor. Der verwendete Datensatz wurde mit dem ATLAS Detektor im Jahr 2015 aufgezeichnet und entspricht einer integrierten Luminosität von 3,16 fb-1. Die W+W- Ereignisse werden über leptonische Zerfälle der W-Bosonen selektiert, wobei jeweils eines der W Bosonen in ein Elektron und ein Elektronneutrino und das andere in ein Myon und ein Myonneutrino zerfällt. Der gemessene Wirkungsquerschnitt in einem Referenzphasenraum, der nahe der Detektorakzeptanz definiert ist, beträgt σ (fiducial, W+W-) = 529 ± 20 (stat.) ± 50 (syst.) ± 11 (lumi.) fb. Das Ergebnis stimmt innerhalb der Fehlergrenzen mit der besten verfügbaren Standardmodell-Vorhersage von 478 ± 17 fb überein. Die kinematischen Verteilungen der im Zerfall der beiden W Bosonen produzierten Leptonen wurden genauer untersucht, um die drei- Eichbosonenkopplung bei den WWγ und WWZ Vertizes zu messen. Abweichungen dieser Kopplungen vom Standardmodell können ein Hinweis auf neue Physik sein. Für die Größen, welche diese anomalen Kopplungen parametrisieren, wurden Konfidenzintervalle berechnet. Die beobachteten Kopplungen stimmen mit dem Standardmodell überein.
This thesis presents a measurement of W+W- production cross section with the pp collision data collected at the ATLAS detector in the year of 2015. The dataset corresponds to a centre-of-mass collision energy of √s = 13 TeV with a total integrated luminosity of 3.16 fb-1. The W+W- signal events are selected using a signature where one of the W bosons decays into an electron and an electron neutrino while the other produces a muon with an associated muon neutrino. The measured cross section in the chosen fiducial phase space close to detector acceptance is σ (fiducial, W+W-) = 529 ± 20 (stat.) ± 50 (syst.) ± 11 (lumi.) fb. The result within the assigned uncertainties is compatible with the best available Standard Model prediction of 478 ± 17 fb. The observed kinematic spectrums of the produced leptons from the decay of the two W bosons are further investigated to study the triple gauge boson couplings at the WWγ und WWZ vertices. The deviation of these couplings from the Standard Model can probe the existence of new physics. The confidence intervals have been calculated for the parameters representing these anomalous couplings. The observations are consistent with the Standard Model expectations.
APA, Harvard, Vancouver, ISO, and other styles
8

Jeanty, Laura Elizabeth. "Measurement of the WZ Production Cross Section in Proton-Proton Collision at \(\sqrt s = 7 TeV\) and Limits on Anomalous Triple Gauge Couplings with the ATLAS Detector." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11023.

Full text
Abstract:
In this dissertation, we present a study of WZ production in proton-proton collisions at a center-of-mass energy of 7 TeV. The data analyzed was collected by the ATLAS detector and corresponds to an integrated luminosity of \(4.6 fb^{−1}\) provided by the Large Hadron Collider in 2011. We select WZ events in the fully leptonic decay mode with electrons, muons, and missing transverse energy in the final state. Events are required to have three isolated leptons with significant transverse momentum, a large missing transverse energy, a Z candidate reconstructed from two of the selected leptons, and a W candidate reconstructed from the missing transverse energy and third lepton. The major backgrounds to the WZ signal in the leptonic decay channel are Z+jets events, ZZ production, Z+photon events, and events with top quarks. We estimate the Z+jets and top quark background contributions from data and take the expected contribution for the other background processes from simulation. We observe 317 WZ candidates in data, with a background expectation of \(68\pm10\) events. The total production cross section is extracted from the selected sample using a maximum likelihood method and is determined to be \(19.0^{+1.4}_{-1.3} (stat) \pm0.9 (syst) \pm0.4 (lumi) pb\), which is consistent with the next-to-leading Standard Model prediction of \(17.6^{+1.1}_{-1.0} pb\). WZ production in the Standard Model includes a contribution from the WWZ triple gauge boson vertex. If new physics beyond the Standard Model exists and interacts with W and Z bosons, the coupling of the WWZ vertex could differ from the Standard Model prediction. We set limits on anomalous triple gauge boson couplings using the transverse momentum spectrum of Z bosons in the selected sample. We derive the 95% confidence interval for three model-independent anomalous triple gauge couplings using a frequentist approach and set the most stringent bounds to date on two of the three parameters.
Physics
APA, Harvard, Vancouver, ISO, and other styles
9

Jhingree, Jacquelyn. "The effect of charge and temperature on gas phase protein conformational landscapes : an ion mobility mass spectrometry investigation." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/the-effect-of-charge-and-temperature-on-gas-phase-protein-conformational-landscapes--an-ion-mobility-mass-spectrometry-investigation(1ecd7b47-eca8-4bcb-a13a-2b2606ade74b).html.

Full text
Abstract:
The amino acid sequence of a protein determines its 3D fold, the ease with which its native structure is formed, its function, the conformational preferences sampled and the tendency to interact with itself (aggregation) and binding partners. In addition, certain conformational preferences can lead to dysfunction resulting in different diseased states in organisms. All of these conformations can be described by a protein's energy landscape; a native (functional) state being localised at the energy minimum. As protein dynamics is crucial to function it is important to monitor the sampling of different conformations. Thus the work in this thesis reports on two methods for monitoring protein conformation and conformational change in the gas phase using ion mobility mass spectrometry (IM-MS). The measurement from IM-MS methods allow the determination of a collision cross section (CCS) which is an indicator of a molecule's 3D shape. First, the effect of charge on protein structure is investigated by manipulation of protein charge, post electrospray ionisation (ESI), by exposure to radical anions of the electron transfer reagent, 1,3-dicyanaobenzene; the charge reduced products formed are the result of electron transfer to the charged protein without any dissociation (ETnoD). IM-MS is used to monitor the conformational preferences of the altered and unaltered precursor and its products. Secondly, intermediate (transient) conformers are formed by activating the charged protein in the source region of an instrument post ESI. Activation of the protein precursor allows the sampling of different conformational preferences after energetic barriers have been overcome; IM-MS following activation allows for the monitoring of protein conformational change before and after. Further, variable temperature (VT) IM-MS allows for the deduction of intermediate structures with a focus on measurements at cryogenic temperatures whereby intermediate structures can be 'frozen out' post activation; intermediate structures which would otherwise anneal out at room temperature. With both methods a range of conformer populations are mapped for different protein molecules sampled upon different energetic inputs (via activation) and the disruption of intramolecular neutralising contacts/salt bridges (via charge reduction) one of the main interactions responsible for maintaining the structural integrity (3D fold) of proteins.
APA, Harvard, Vancouver, ISO, and other styles
10

Follega, Francesco Maria. "Search for boosted Higgs bosons decaying to b-quarks at sqrt{s}=13 TeV with the ATLAS detector." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/259651.

Full text
Abstract:
A search for the Higgs boson produced with large transverse momentum and decaying as H -> bb is presented, using the 80 fb^{-1} from the dataset collected by the ATLAS detector at sqrt{s}=13 TeV. The Higgs boson is reconstructed as a large-R jet with two b-tagged variable radius track-jets. The work focuses on a peculiar event topology in which the Higgs is produced in association with another Large-R jet. Considering events with reconstructed pT above 480 GeV and with a reconstructed mass from 70-230 GeV, a signal significance of 1.6 sigma for the Higgs and of 5 sigma for the V (Z boson + W boson) is observed. Furthermore, the new Full Run2 analysis is presented, using 136 fb^{-1} from the dataset collected by the ATLAS detector at sqrt{s}=13 TeV. The strategy up to the computation of the expected sensitivity for the Higgs boson is presented in this thesis. The validation of the background modeling is described in details, including tests on data. A preliminary extraction of the Z boson signal is performed and the measured signal strength corresponds to muZ = 0.82 +/- 0.09.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Collision Cross Section (CCS)"

1

Henriksen, Niels Engholm, and Flemming Yssing Hansen. Bimolecular Reactions, Dynamics of Collisions. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198805014.003.0004.

Full text
Abstract:
This chapter discusses the dynamics of bimolecular collisions within the framework of (quasi-)classical mechanics as well as quantum mechanics. The relation between the cross-section and the reaction probability, which can be calculated theoretically from a (quasi-)classical or quantum mechanical description of the collision, is described in terms of classical trajectories and wave packets, respectively. As an introduction to reactive scattering, classical two-body scattering is described and used to formulate simple models for chemical reactions, based on reasonable assumptions for the reaction probability. Three-body (and many-body) quasi-classical scattering is formulated and the numerical evaluation of the reaction probability is described. The relation between scattering angles and differential cross-sections in various frames is emphasized. The chapter concludes with a brief description of non-adiabatic dynamics, that is, situations beyond the Born–Oppenheimer approximation where more than one electronic state is in play. A discussion of the so-called Landau–Zener model is included.
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Collision Cross Section (CCS)"

1

Heerdt, Gabriel, Leandro Zanotto, Paulo C. T. Souza, Guido Araujo, and Munir S. Skaf. "Collision Cross Section Calculations Using HPCCS." In Methods in Molecular Biology, 297–310. New York, NY: Springer US, 2019. http://dx.doi.org/10.1007/978-1-0716-0030-6_19.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Nagpal, Rajesh, and Alan Garscadden. "A New Collision Cross Section Set for Silane." In Gaseous Dielectrics VII, 39–45. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1295-4_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Sharma, Sachchidanand. "Calculation of Charge Transfer Cross Section for Electron Capture Collisions By N2+ Ions in Neutral Atoms." In Fundamental Processes in Atomic Collision Physics, 729–36. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2125-5_42.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Muñoz, Josep Anton. "Evolution of a continental collision belt: ECORS-Pyrenees crustal balanced cross-section." In Thrust Tectonics, 235–46. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-3066-0_21.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Stow, S. M., and J. C. Fjeldsted. "CHAPTER 3. Fundamentals of Uniform-field Drift Tube Ion Mobility and Collision Cross Section." In Ion Mobility-Mass Spectrometry, 52–82. Cambridge: Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781839162886-00052.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Janev, R. K. "Collision Processes of Atomic and Molecular Hydrogen in Fusion Plasmas: The Cross-Section Data Status." In Springer Series in Chemical Physics, 415–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27362-x_19.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Hermans, C., A. C. Vandaele, S. Fally, M. Carleer, R. Colin, B. Coquart, A. Jenouvrier, and M. F. Merienne. "Absorption Cross-section of the Collision-Induced Bands of Oxygen from the UV to the NIR." In Weakly Interacting Molecular Pairs: Unconventional Absorbers of Radiation in the Atmosphere, 193–202. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0025-3_16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Kotkin, Gleb L., and Valeriy G. Serbo. "Scattering in a given field. Collision between particles." In Exploring Classical Mechanics, 12–15. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198853787.003.0003.

Full text
Abstract:
This chapter addresses the differential and total cross section for the scattering of particles by central field, the scattering of particles by the fixed to ellipsoid, and the small angles scattering of particles by central field as well as a dipol. The authors also discuss the cross section for the process where a particle falls towards the centre of the field, decay of particles and the distribution of the secondary particle, and the change in intensity of a beam of particles travelling through a volume filled with absorbing centres.
APA, Harvard, Vancouver, ISO, and other styles
9

Kotkin, Gleb L., and Valeriy G. Serbo. "Scattering in a given field. Collision between particles." In Exploring Classical Mechanics, 139–55. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198853787.003.0016.

Full text
Abstract:
This chapter addresses the differential and total cross section for the scattering of particles by central field, the scattering of particles by the fixed to ellipsoid, and the small angles scattering of particles by central field as well as a dipol. The authors also discuss the cross section for the process where a particle falls towards the centre of the field, decay of particles and the distribution of the secondary particle, and the change in intensity of a beam of particles travelling through a volume filled with absorbing centres.
APA, Harvard, Vancouver, ISO, and other styles
10

Cantor, Brian. "The Arrhenius Equation." In The Equations of Materials, 91–108. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198851875.003.0005.

Full text
Abstract:
The Arrhenius equation describes the way in which the speed of a chemical reaction varies exponentially with temperature. This chapter describes the thermodynamics of chemical reactions, the complexity of chemical kinetics, their explanation in terms of atomic and molecular collisions and transitionary activated states, and the concepts of molecularity, reaction order and collision and reaction cross section. Svante Arrhenius was the son of an estate manager at Uppsala University. He was tremendously innovative scientifically, inventing the interdisciplinary fields of physical chemistry, the ionic theory of acids and bases, environmental science, global warming and immunochemistry. He had longstanding feuds with many, more conventional, scientists, particularly his doctoral supervisors, who nearly failed him because they thought his development of ionic theory was neither ‘proper’ physics nor ‘proper’ chemistry. He became Director of the Swedish Academy of Sciences Högskola in Stockholm, where he oversaw the initiation of the Nobel Prizes in Physics, Chemistry, Medicine, Literature and Peace.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Collision Cross Section (CCS)"

1

Isaac, Giorgis, Hernando Olivos, and Robert Plumb. "Lipid separation and structural characterization using travelling wave cyclic ion mobility." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/snxj7960.

Full text
Abstract:
The analysis and structural characterization of lipids remain challenging due to the chemical structure diversity and isobaric nature. In recent years, liquid chromatography coupled to ion mobility-mass spectrometry (LC-IM-MS) for lipidomics has shown advantages in lipid identification. In particular, collision cross section (CCS) obtained from the IM measurements represents a physical property that can be used to enhance the confidence of lipid identification. Data were collected on a hybrid quadrupole cyclic IM (cIM) orthogonal acceleration time-of-flight instrument. It provides the option to perform either a single pass, or multiple passes until the desired resolution is achieved. MS and CID fragmentation data were obtained on precursor IM separated lipids followed by TOF mass measurement. Using the advanced travelling WAVE technology, a portion of the IMS separation can be selected and stored in a Pre-Array trap region. The stored ions can be re-injected to enable ion mobility analysis and by repeating this IMS to the “n” experiments can be performed. Ion mobility provides additional separation dimension that allows the separation of isobaric and isomeric compounds. The separation and structural characterization of different lipid classes using cIM is currently under study. Different lipid classes with positional isomer (Sn1/Sn2 vs Sn2/Sn1), different double bond positions, cis and trans isomers, glucosyl and galactosyl ceramide isomers, PIP and ganglioside isomers were investigated. Some of the isomers were baseline separated only after 1 pass (approximately at 65 IMS resolution) and others with 50 passes (approximately at 450 IMS resolution). In summary, cyclic IMS provides novel, scalable ion mobility resolution and the increased resolution is useful to resolve and separate isobaric and isomeric lipids species. Advanced modes of operation with ion activation followed by ion mobility separation offers new insights into lipid structural characterization.
APA, Harvard, Vancouver, ISO, and other styles
2

Raseev, G. "Photoionization differential cross section and spin polarization of molecular photoelectrons." In Half collision resonance phenomena in molecules. AIP, 1991. http://dx.doi.org/10.1063/1.40551.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Cajahuaringa, Samuel, Leandro N. Zanotto, Daniel L. Z. Caetano, Sandro Rigo, Herve Yviquel, Munir S. Skaf, and Guido Araujo. "Ion-Molecule Collision Cross-Section Simulation using Linked-cell and Trajectory Parallelization." In 2022 IEEE 34th International Symposium on Computer Architecture and High Performance Computing (SBAC-PAD). IEEE, 2022. http://dx.doi.org/10.1109/sbac-pad55451.2022.00026.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Cavalieri, Stefano, and Milva Celli. "Light absorption during a resonant or near-resonant collision: Study of the cross section in the far-wing." In The 13th international conference on spectral line shapes. AIP, 1997. http://dx.doi.org/10.1063/1.51864.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Lasri, B., R. Benallal, M. Bouamoud, and J. Hanssen. "Schwinger variational approach for Balmer- emission cross section in proton-hydrogen atom collision at intermediate and high impact energies." In THE 8TH INTERNATIONAL CONFERENCE ON PROGRESS IN THEORETICAL PHYSICS (ICPTP 2011). AIP, 2012. http://dx.doi.org/10.1063/1.4715459.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Larson, Guy C., and Piotr Froelich. "A first born approximation calculation of the total cross-section for ionization of the αμ+ ion by collision with a deuteron." In AIP Conference Proceedings Volume 181. AIP, 1988. http://dx.doi.org/10.1063/1.37878.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Ghasemi, Sara. "Cross section measurement of $t\overline{t}$$\gamma$ production in $pp$ collision at $\sqrt{s} = 8~\mathrm{TeV}$ with the ATLAS experiment." In The European Physical Society Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.314.0761.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Takei, Masahiro, Mitsuaki Ochi, Yoshifuru Saito, and Kiyoshi Horii. "Density Distribution Evaluation of Free Fall Particles Using CT and State Transition Matrix." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45213.

Full text
Abstract:
Spatial particle density distribution images in a pipe cross section have been evaluated by means of state transition matrix, which is a parameter indicating the dominant particle density transition patterns among time series images consisting of CT 2D-space and 1D-time. State transition characterizes the transition patterns for positions in a cross section as monotonous transitions, sudden transitions, and extreme value transitions. In free fall particles in a vertical pipe, high, sudden and extreme value transitions do not occur, because particle flow rate at this position is low, and therefore the probability of collision among particles is also low. A high, sudden and extreme value transitions occur near the pipe center when the particle flow rate is high, because the probability of collision among particles is high.
APA, Harvard, Vancouver, ISO, and other styles
9

Stu¨bing, S., M. Dietzel, and M. Sommerfeld. "Modelling Agglomeration and the Fluid Dynamic Behaviour of Agglomerates." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-12025.

Full text
Abstract:
For modeling agglomeration processes in the frame of the Lagrangian approach, where the particles are treated as point masses, an extended structure model was developed. This model provides not only information on the number of primary particles in the agglomerate, but also on the geometrical distension of the agglomerates. These are for example the interception diameter, the radius of gyration, the fractal dimension and the porosity of the agglomerate using the convex hull. The question however arises now, which is the proper agglomerate cross-section for the calculation of the drag force. In order to find an answer, the Lattice-Boltzmann-Method (LBM) was applied for simulating the flow about fixed agglomerates of different morphology and number of primary particles involved. From these simulations the drag coefficient was determined using different possible cross-sections of the agglomerate. Numerous simulations showed that the cross-section of the convex hull yields a drag coefficient which is almost independent on the structure of the agglomerate if they have the same cross-sectional area in flow direction. Using the cross-section of the volume equivalent sphere showed a very large scatter in the simulated drag coefficient. This information was accounted for in the Lagrangian agglomeration model. The basis of modeling particle collisions and possible agglomeration was the stochastic inter-particle collision model accounting for the impact efficiency. The possibility of particle sticking was based on a critical velocity determined from an energy balance which accounts for dissipation and the van der Waals adhesion. If the instantaneous relative velocity between the particles is smaller than this critical velocity agglomeration occurs. In order to allow the determination of the agglomerate structure reference vectors are stored between a reference particle and all other primary particles collected in the agglomerate. For describing the collision of a new primary particle with an agglomerate the collision model was extended in order to determine which primary particle in the agglomerate is the collision partner. For demonstrating the capabilities of the Lagrangian agglomerate structure model the dispersion and collision of small primary particles in a homogeneous isotropic turbulence was considered. From these calculations statistics on the properties of the agglomerates were made, e.g. number of primary particles, radius of gyration, porosity, sphericity and fractal dimension. Finally, the dispersion of particles in vertical grid turbulence was calculated by the Lagrangian approach. For one selected model agglomerate, dispersion calculations were performed with different possible characteristic cross-sections of the agglomerate. These calculations gave a deviation of the mean square dispersion of up to 20% after a dispersion time of 0.4 seconds for the different cross-sections. This demonstrates that a proper selection of the cross-section is essential for calculating agglomerate motion in turbulent flows.
APA, Harvard, Vancouver, ISO, and other styles
10

Noh, Sung Hwan, Jung Kwan Seo, Jeom Kee Paik, and Samy A. M. Youssef. "Rapid Assessment of Hull Girder Collapse for Corroded Double Hull Oil Tanker After Collision." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54667.

Full text
Abstract:
Corroded tankers might be subjected to a very serious structural damage if involved in collision accidents. For understanding or preventing the collision accidents, various studies are being proposed by researchers to improve the analysis method. In this paper, four types of double hull oil tankers (Panamax, Aframax, Suezmax and VLCC) are used. Probabilistic approach is used to create ship-ship collision scenarios for each target structure and the ultimate longitudinal hull girder strength of the hypothetical oil tanker’s hull cross-section. The ALPS/HULL is used to simulate and is intelligent supersize finite element method (ISFEM) software. A relevant probability density function (PDF) is introduced using the results from finite element simulations of the ship-ship collisions, which is commonly used to predict residual strength.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Collision Cross Section (CCS)' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography